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No. 2.4K was the data rate that was guaranteed to be achievable for customer dial-up systems which used the PSTN.

For dedicated (non-switched) data, Telecom offered 2.4K up to 64/48K across the very same cables. It was the switch toploogy, not the cables, that dictated the limit. Please, understand the subtle difference. Indeed, with specaialised equipment, a 2M, guaranteed, high reliability, high purity, nil error, bi-directional service could be provided.

You badmouth 'the boffins', and yet you appear to know, or understand, little.

As for 360M down 'phone lines', I would like to see the actual application. I have ADSL2+ which achieves ~15M line-rate download, and the S/N ratio is just 6dB. That is not far from the edge.

Load an average 'phone line' cable with a substantial number of 360M services, and you will have an excellent radiator, or at least cross-talk generator.